When you add an image from your camera etc, they are always in RGB. This is a problem, this is because some RGB colours cannot be printed. RGB is photoshop's default colour mode. Photoshop changes RGB's to printable colours, the shift can be quite dramatic.
Why don't we work in CMKY?
- Some aspects of photoshop can only be used in the RGB colour mode.
- CMKY files are larger.
It is best to work in RGB while editing, then change it to CMKY.
Duotones
Channels
Transparency of printing inks.
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